Mortising machine



Dec. 3, 1929. R. 1 CARTER MORT I S ING MACHINE Filed Dec. 13, 1928 Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE RAY L. CARTER, 0F PHOENIX, NEW YORK, ASSIGNOR T0 R. L. CARTER COMPANY, INC., A CORPORATION OF NEW YORK MORTISING MACHINE Application led December 13, 1928. Serial No. 325,855.

This invention relates to portable mortising and routing machines, designed especially for sinking mortises for door locks, and the like, and has for its object to provide a handcontrolled motor-driven machine arranged to be clamped to a door, or other part, the motor and tool being movable bodily in horizontal and vertical directions simultaneously, by manually controlled means, for effecting cuts arallel to the edge of a door, as well as to orm the top and bottom margins of the mortises parallel and truly at right angles to said edge. A further object is to provide novel means for jogging or advancing the tool, and for accurately determining the height and depth of the mortises, the said jogging mechanism including means for preventing back- Ward movement of the tool during the mortising operations. And a further object is to improve, simplify and modify the mortising device shown and described in United States Patent Number 1,642,723, dated September 20, 1927.

The various features and parts of the invention will be understood from the detail description which follows, and by reference to the accompanying drawing, in which- Figure l is a side elevation of the complete machine, mounted ready for operation. F ig. 2 is a rear-end elevation of the same. Fig. S is an enlarged detail view of the primary jogging arts. Fig; 4 is a top plan view of the device o Fig. 1. iig. 5 is a front ond elevation of the same. And Fig. 6 is a broken frontend elevation and vertical section, the latter taken on line 6 6 of Fig. l, showing operation of the lever that controls the forward and backward movements of the motor and tool.

In the drawing, 2 represents an ordinary electric motor, enclosed by a casing 2', and having an armature shaft 2a, by which a tool 3 is driven, the shank of the tool comprising a Worm that conveys the chips from the mortise. The motor is rigidly mounted upon parallel guiderods 4, Which are secured to rearwardly extending lugs 2b of the casing, by fasteners 2. 5 represents a frame that supports and is movable towards and from the work with the motor, the top and bottom ends of the frame being formed With spaced per` forated lugs 5', that slidably support the rods 4, and facilitate vertical movements of the motor. These movements of the motor relatively to the frame 5 are controlled by a threaded gage-rod 6, Which is seated rigidly in a lug 6 of the casing 2 (see Fig. 4), and plays in a bearing 5a of the frame, against which a thumb-nut 6a comes to rest at the end of the downward travel of the motor and tool. By this arrangement, the spacing of the nut 6a from the bearing 5a determines the height of the mortises. The frame 5 is slidably mounted upon parallel guide-rods 7, arranged horizontally With respect to the rods 4, and which pass through bearing lugs 5b formed upon out-turned flanges 5 of the frame. The forward ends of the rods 7 are secured rigidly to the body of a bracket 8, by fasteners 8. The bracket 8 is arranged to overlap one side of a door, or other Work, as A, and includes adjustable clamping meinbers 9 and 9 arranged in pairs and spaced to enable the tool 3 to cut mortis/es between said clamps. The clamps 9-9` are adapted to engage the opposite sides of the door, as shown in Figs. l, 2, 4 and 5. The clamps of each pair are adapted to move towards and from each other, by means of right and left hand threading of similar screws 10 and l0', the clamps being held from rotation on the screws and being guided by means of rods 8, which are anchored in the body 8, and engage sockets 9B of the clamps. The screws 10e-l0 are provided with heads 10a for manually operating the clamps. The screws l() are fitted with sleeves 10, which engage the edge of the door and prevent the threads from mutilating said edge.

The motor is moved downwardly for effectfbody8. The rotation of the worm 13 is inin the cutting of the mortise, as a, as shown in `ig. 2, by means oi a hand-lever 12, whose forward end is pivoted by a bolt l2', to a laterally extending arm 5d of the trame, the said lever being connected niedially by a link 'l2L to a depending lug 2d oi' the motor casing by bolts 12b. The motor is lifted and normally held in its uppermost position, shown in Figs. l, 2, 4 and 5, by a spring l2d supported by the-armV 5?' one end otY the spring extending rearwardly and engaging a lug 12C of lever 12, as shown in Fig. l.

The forward advancing of the motor and tool to engage the =work is controlled by a worm 13, one end of which is formed with a disc 13 disposed beneath the motor, and the worm being rotatably supported by one of the flanges 5 of the frame, the other end of the worm being loosely journaled in spaced tbea-'ringscformed on the top side of the 'termittent, and is eected by a pawl or trigger 14, which successively engages equidistantly spaced studs or pins 13a, that project from one face of the disc 13, during the downward strokes of the motor. The pawl 14, according to Figs. 2 and 3, is substantially L-shaped, andis pivoted to the lug :2l1 of the casing. This disposes the arm 14 of the pawl above and yin the path of the nearest stud 13, while thearm 14` partially overlaps thesaid lugiand is heldin the full line position of Fig. 3, against said lug, by gravl ity. By this arrangement, at the start of the downward movement ofthe motor, which the operator effects by depressing the lever 12, the arm 14 engages the stud directly beneath it,and rotates the-disc 13 a partial turn, which advances the tool 3 for effect- -ing ithe downward cut, and brings the next stud in order into the operative position. The tool continues the cutting until the gagenut 6 engages the top end ot the frame Then the motor is againfelevated, either by the spring 12c1 or manually, the arm 14: en-

counters a-new Astud` 13a and is rocked to the dotted position of Fig. 3, and thereafter drags loosely over the stud and ii-nally resumes the operative position, ready for the next cutting stroke, when t-he frame is stopped by the nut 6a, and so on.

According to the present construct-ion and arrangement, the tool 3 only cuts during its downward stroke. The step-by-step horizontal movements or advances ot the motor Yand lcool during the sinking of the mortises are maintained, by means oi' a rockable lever 15, which'is'pivoted at 15 to the bearinglugs 8c of the bracket. The lower end of lever -15 is normally positioned between the lugs 8, and said end is formed with a tooth 15a-'and engages, nut-like, the threads of the worm, the lever being held resiliently in the noperative position, by a ,cushion spring '16, shown in Figs. 4 and 5. The horizontal dimension or depth of the mortise a, is regulated by a pair of nuts 13C--13d, which are self-retaining when screwed towards each other, in ar well-known manner. To release and return the motor to the inoperative position, shown in Figs. 1 and 4, the operator first shuts oli1 the motor, by means of a switch S, and then rocks lever l5, as shown in Fig. (l. This disen 'ages the tooth l5a from the worm, and ena les the motor to be slid away from the door A upon the guides 7. The motor may be supplied with current by wires 2".

Having thus described myinventiom what I claim, is-

l. ln a mortising machine, a bracket formed to be clamped to the work, a pair of spaced arallel rods extending outwardly from said bracket, a frame having spaced pairs of horizontally alined bearings to slidably receive said rods, spacedpairs of vertically alined bearings on said rame,guide rods slidable in said vertical airs of bearings, a motor driven tool secure to said guide rods and movable therewith in a direction: substantially-at right angles to the AInovemcnt of said frame7 a forwardly extending arm carried by said frame, a horizontal lever having one end pivotally connected to said arm and having its free end extending;4 beyond the rear end of the toiol,.a vdepending link carried by the motor driven tool and having its free end pivotally connected tothe lever intermediate the ends bf the latter, whereby the motor is manually moved in a direction vertically downwardly in 4said frame, slpring means interposed between said arm an lever for normally urging said motor driven tool vertically upwardl and means for automatically advancing t e tool toward the work upon downward movement of said tool.

2. In a mortisinT machine, a bracket formed to be clamped to the work, a pair of spaced parallel rods extending outwardly from said bracket, a frame having spaced pairs of horizontally valined bearings to slidably receive said rods, spaced pairs 'of vertically alined bearings on said frame, Guide rods slidable in said vertical pairs of tbearings, a single vertically disposed bearing formed on said frame intermediate the guide rods, a motor driven tool secured to the guide rods and movable therewith in a direction substantially at right angles to the movement of the frame, a vertically extending gage rod carried by the motor and movable through the last named single bearing for limiting the movement of the motor driven tool in one direction, a forwardly extending arm carried by said frame, a horizontal lever having one end-pivotally connected to said arm and having its free end extending beyond the rear end of the tool, a dependin link carried by the motor driven tool an having its free end pivotally connected to the lever intermediate the ends of the latter, whereby the motor is manually moved in a. direction vertically downwardly in said frame, spring means interposed between said arm and lever for normally urging said motor driven tool vertically upwardly, and means for automatically advancing the tool toward the work upon downward movement of said tool.

In testimony whereof I affix my signature.

RAY L. CARTER. 

